src/basic/gcrypt-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #if HAVE_GCRYPT
   4 #include <gcrypt.h>
   5
   6 #include "gcrypt-util.h"
   7 #include "hexdecoct.h"
   8
   9 void initialize_libgcrypt(bool secmem) {
  10         const char *p;
  11         if (gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
  12                 return;
  13
  14         p = gcry_check_version("1.4.5");
  15         assert(p);
  16
  17         /* Turn off "secmem". Clients which wish to make use of this
  18          * feature should initialize the library manually */
  19         if (!secmem)
  20                 gcry_control(GCRYCTL_DISABLE_SECMEM);
  21         gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
  22 }
  23
  24 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
  25         _cleanup_(gcry_md_closep) gcry_md_hd_t md = NULL;
  26         size_t hash_size;
  27         void *hash;
  28         char *enc;
  29
  30         initialize_libgcrypt(false);
  31
  32         hash_size = gcry_md_get_algo_dlen(md_algorithm);
  33         assert(hash_size > 0);
  34
  35         gcry_md_open(&md, md_algorithm, 0);
  36         if (!md)
  37                 return -EIO;
  38
  39         gcry_md_write(md, s, len);
  40
  41         hash = gcry_md_read(md, 0);
  42         if (!hash)
  43                 return -EIO;
  44
  45         enc = hexmem(hash, hash_size);
  46         if (!enc)
  47                 return -ENOMEM;
  48
  49         *out = enc;
  50         return 0;
  51 }
  52 #endif